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Old Copper Culture tools : copper tools from Northern Wisconsin, 4,000-1,200 B.C. - Turning Points in Wisconsin History - Wisconsin Historical Society Online Collections
Paleoindian Period (16,000–8000 BC) - Encyclopedia Virginia
Rothenberger 4000 B-Press Tool Kit 15-50 from Reece
Northern B.C. First Nation clan says ancient tools found at pipeline work site - Vernon Morning Star
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Study on B.C. First Nations stone tools debunks theory about their origin | Warrior Publications
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